colorist
US /ˈkʌl.ər.ɪst/
UK /ˈkʌl.ər.ɪst/

1.
a person who colors hair as a profession
:
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She visited a professional colorist to get her hair dyed blonde.
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The salon has several experienced colorists on staff.
2.
an artist who uses color in a distinctive or skillful way
:
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The painter was known as a brilliant colorist, mastering vibrant hues.
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Her work as a comic book colorist brought the illustrations to life.